Article

Dynamic hyperinflation leads to dyspnoea and consequent limitations
in functional capacity in chronic obstructive pulmonary disease. It has been
shown that the response to pursed-lips breathing in terms of dynamic
hyperinflation and lower-limb exercise capacity is variable, and its effects on
activities of daily living are unknown. This study aimed to evaluate the effect
of pursed-lips breathing on dynamic hyperinflation and functional capacity in
patients with chronic obstructive pulmonary disease in a lower-limb exercise test
and in a multiple-task activities of daily living test. DESIGN: Randomized
cross-over study. PATIENTS: Twenty-five patients with chronic obstructive
pulmonary disease (16 men, mean age 64 +/- 7 years, forced expiratory volume in 1
s (FEV1) = 41.7 +/- 14.7% predicted). METHODS: Patients randomly performed two
6-min walk tests (6MWT) with and without pursed-lips breathing (6MWT(PLB) and
6MWT(Non-PLB)) and two Glittre-ADL tests with and without pursed-lips breathing
(TGlittre(PLB) and TGlittre(Non-PLB)). Inspiratory capacity was assessed at
baseline and immediately after the tests. RESULTS: The 6MWT(Non-PLB) and
TGlittre(Non-PLB) induced similar magnitude dynamic hyperinflation (0.22 +/- 0.24
l and 0.31 +/- 0.23 l, respectively; p > 0.05). Pursed-lips breathing did not
improve dynamic hyperinflation induced by the 6MWT (0.24 +/- 0.20 and 0.22 +/-
0.24 l, respectively, with and without pursed-lips breathing;
p > 0.05). Dynamic
hyperinflation in the TGlittre(PLB) was significantly lower than in the
TGlittre(Non-PLB) (0.19 +/- 0.20 l and 0.31 +/- 0.23 l, respectively; p = 0.02).
Pursed-lips breathing did not improve 6MWT or TGlittre performance. CONCLUSION:
Pursed-lips breathing reduced dynamic hyperinflation in the TGlittre, but not in
the 6MWT. However, pursed-lips breathing did not improve functional capacity.

Langue : ANGLAIS